CVE-2026-84649

High

Description

In Stapler 1839.ved17667b_a_eb_5 through 2107.v8dfcb_e8ed317 (both inclusive), except 2088.2093.vd7c3e58008a_6, included in Jenkins 2.447 through 2.579 (both inclusive), LTS 2.452.1 through 2.568.2 (both inclusive), an HTTP endpoint serving dynamically generated JavaScript resources embeds the user's cross-site request forgery (CSRF) token (crumb) as a string literal, allowing attackers with control over a page hosted on the same site as Jenkins to obtain a valid crumb for the targeted user's session and perform actions on their behalf.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Jenkins

PublishedSep 2, 2026

First seenSep 2, 2026

Weakness typeCWE-352Cross-site request forgery (CSRF)

How to fix

Vendor advisories

jenkins.io/security/advisory/2026-09-02/#SECURITY-3878

Affected products

Product	Affected versions	Fixed in
Jenkins Project Jenkins	No range specified	—

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